Tech. Sgt. Thomas Conroy, 459th Aircraft Maintenance Squadron crew chief, attaches a fuel line to a KC-135R Stratotanker prior to refueling on the Joint Base Andrews, Maryland, flight line July 20, 2017. The KC-135 is refueled using a truck equipped with a hydraulic system to draw fuel from an underground reservoir onto the aircraft. (U.S Air Force photo/Tech. Sgt. Kat Justen)